Suppose I create rocket boots and brand them as "Super Jumpers". After a couple months of selling them, I stealthily create a new brand of rocket boots called "Mega Fliers".
I do not publicly reveal them as created by the same person or corporation, and perhaps I even market them with improvements I intentionally left out of the original boots.
Would this alone be illegal, or only under certain conditions? For example, if I had a monopoly on rocket boots, if I was inflating prices, or if using other consumer manipulation to make them purchase more of both.